/Engine/Source/Runtime/GeometryCore/Public/FrameTypes.h
X/Y/Z axes of frame. This is more efficient than calculating each axis separately.
void GetAxes ( [TVector](API\Runtime\Core\Math\TVector)< RealType > & X, [TVector](API\Runtime\Core\Math\TVector)< RealType > & Y, [TVector](API\Runtime\Core\Math\TVector)< RealType > & Z ) const